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Home > Blogs > Decking Hub > Does Thermo Ash Decking Need Oiling?
Maintenance Guide

Does Thermo Ash Decking Need Oiling?

Jun 30, 2026 6 min read Southgate Timber

This is one of the most common questions customers ask when considering premium timber decking. The answer is not simply yes or no. It depends on what the customer wants the decking to look like over time.

In this article

  • Why customers ask this question
  • Is oiling essenatial?
  • What happens if you do not oil it?
  • When oiling makes sense

Why Customers Ask This Question

When a customer invests in a premium decking product, they often want to know how to protect that investment. In many cases, what they really mean is not whether the deck will survive outdoors, but whether it will continue to look the same as it did when first installed.

Is Oiling Essential?

Oiling is usually most important when the goal is to preserve appearance. Like most natural timber used outdoors, Thermo Ash will weather over time if left untreated. Some customers like that weathered effect, while others want to keep the original tone.

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What Happens If You Do Not Oil It?

If Thermo Ash is left untreated outdoors, it will weather naturally. This does not mean the deck has failed. It means it is behaving like natural timber exposed to the elements.

Final Thoughts

Thermo Ash decking does not need oiling in exactly the same way every customer might assume, but oiling is important if the goal is to preserve the original appearance. The real answer depends on the finish you want to keep.

Decking Maintenance Thermo Ash Oiling

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Frequently asked questions
Common question around this topic and what it means for your project.

Does Thermo Ash always need oiling?

No. Oiling is usually about retaining colour rather than basic outdoor survival.

What happens if I leave Thermo Ash untreated?

It will gradually weather and move towards a softer silver-grey tone over time.

When does oiling make the most sense?

It makes the most sense when preserving the original rich tone is important to the overall design.

Need help choosing the right decking?

Speak to the Southgate Timber team for help comparing timber species, samples, fixings and the right option for your project.

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